Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cd94e638b5d7bd…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 12:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 07cffffc30a185dce800182e16a96e85 SHA-1: 6a166b7f02666cdb6d4e4a23d91c779fcd154b74 SHA-256: 90cd94e638b5d7bddd0169c8ee32ab4632169dc16a8cae3b8d98b39fedde751b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files, some hosted on compromised WordPress sites. The presence of a visual download button further supports a phishing or malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://montaze.org/democms/userfiles/file/53236792374.pdf In PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c12a206118a---44793709570.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/98176344348.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce8784d02b---8075777053.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/4al6m1nop5gsnfmd43sipgp8aq/dajezezam.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/37knd43l1l6mt8t41bd0hut62i/42601414343.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0787bac49---mosesojowerosidisid.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/jasenuratidasojawinevas.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/7ea2a5fdec45a716a000adbda6f7fa48/57730238323.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080547dc5369---7676927753.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/30685708138.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/mosati.pdfIn PDF document text
    • http://skncn.com/u/files/36195694541.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/62180741434.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097c43f18cdd---buvizotud.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb87cb814df---bafisaziwasamavevubegaji.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/dagatunubojuwonu.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/63824418704.pdfIn PDF document text
    • https://codecs.ro/images/file/dokopidab.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095cabb1f3a4---dilabeluwun.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/81960909356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=www+kerala+psc+questions+and+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 20656 bytes
SHA-256: 0d9d4efd073b1d5d16464e4b7b66f9cbc6dcee0c1c73f15c0342a40e4a2ccb65
font_01_sfnt_off00011b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A4 10924 bytes
SHA-256: 5a66c470a6d1eb4196cb5a650f51cf86c623b6981196c5f396b8476dff0dcf12

Open this report in the interactive analyzer, or submit your own file for analysis.